using an amd64 machine to cross compile apps for ia32?

[Palle Girgensohn]

Hi!

I need a simple step-by-step guide to use an amd64-machine (FreeBSD-6.0) to 
compile an app for both amd64 and ia32 (aka i386) versions of FreeBSD-6.0.

Do I need to build a cross compiling gcc binary? The app uses some shared 
libraries, do I need to maintain them in ia32-versions somewhere on the 
amd64 machine?

Any tips appreciated, thanks,

Palle